. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. Fia. 891.—Pliolauella newberryi. omata, Hall, 1870, Prelim. Notice Lam. Shells, p. 64, syn. for P. radiata. parallela. Hall, 1883, Pal. N. Y., vol. 5, pi. 78, figs. 22-24, Ham. Gr. radiata, Conrad, 1842, (Nuculitesradiatus,) Jour. Acad. Nat. Sci., vol. 8, p. 248, and Pal. N. Y., vol. 5, pi. 78, figs. 15-21, Ham. Gr. truncata, Hall, 1870, Prelim. Notice Lam. Shells, p. 64, syn. for P. radiata. Pholadomya elongata,
. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. Fia. 891.—Pliolauella newberryi. omata, Hall, 1870, Prelim. Notice Lam. Shells, p. 64, syn. for P. radiata. parallela. Hall, 1883, Pal. N. Y., vol. 5, pi. 78, figs. 22-24, Ham. Gr. radiata, Conrad, 1842, (Nuculitesradiatus,) Jour. Acad. Nat. Sci., vol. 8, p. 248, and Pal. N. Y., vol. 5, pi. 78, figs. 15-21, Ham. Gr. truncata, Hall, 1870, Prelim. Notice Lam. Shells, p. 64, syn. for P. radiata. Pholadomya elongata, see Allorisma elonga- tum. Phthonia, Hall, 1870, Prelim. Notice Lam. Shells, p. 70. Equivalve, elongate-ovate, wider posteriorly; beaks obscure; sur- face radiated and concentrically marked; no teeth ; ligament external. Type P. 86ctifron8< cylindrica. Hall, 1883, Pal. N. Y., vol. 5, pi. 78, figs. 1-4. Ham. Gr. lirat», Hall, 1883, Pal. N. Y., vol. 5, pi. 78, fig. 14, Ham. Gr. nitida. Hall, 1885, Pal. N. Y., vol. 5, p. 477, Chemung Gr. nodocostata. Hall, 1870, Prelim. Notice Lam. Shells, p. 71, and Pal. N. Y., vol. 5, pi. 78, figs. 5-9, Ham. Via. 892.—Plithonia sectlfrons. Left valve. sectifrons, Conrad, 1842, (Cypricardites sectlfrons,) Jour. Acad. Nat. Sci., vol. 8, p. 245, and Pal. N. Y., vol. 5, pi. 78, figs. 10-13, Ham. Gr. trutcata. Hall, 1885, Pal. N. Y., vol. 5, p. 4'.'6, Chemung Gr. Pinna, Linnteus, 1758, Syst. Nat. 10th Ivl. [Ety. pinna, a wing.] Shell long, tri- angular equivalve; beaks terminal, pointed; posterior end broad, tniu- cate, gaping; a subtrigonal, posterior muscular impression,'ond a i-niull reiii- form one at the beaks; cartilage 1( ni.', narrow, internal, supported by a Hltii. der lidge close witliin the cardinul edges; no teeth; shell of one internal laminated layer, and an external ver- tically fibrous layer. Type P. F(|iia- mosa. A living genus that sometiinua attains a length of two feet, and ranH from low water to sixty fathomw. It
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